Ford F-350 SD slipping problems

Filed Sep 15, 2026 · Electrical, Engine · MO

On June 9, 2026, the vehicle received a PCM reprogramming under Ford Recall 21E01. Before the update, the transmission had no symptoms: no slipping, no warning lights, and no diagnostic trouble codes. Between June 9 and August 11, the vehicle accumulated 1,894 miles. On August 11, 2026, while driving about 60 mph, the vehicle suddenly downshifted from sixth to fifth gear without input. A clunk was felt, followed by complete loss of all gears. There were no warning lights, no diagnostic trouble codes, and no limp‑mode activation. The failure was sudden and total. A diesel shop retrieved the strategy values after the incident, which showed no recorded indication of transmission degradation prior to the PCM update. The failure occurred less than 2,000 miles after the PCM reprogramming. The vehicle was in factory‑stock condition. The incident raises concern that the updated PCM calibration may have affected torque calculation, shift coordination, or diagnostic monitoring, resulting in an uncommanded downshift and loss of all gears without protective response.

Filed Aug 11, 2026 · Transmission · 130,000 miles · KY

The contact owns a 2019 Ford F-350 SD. The contact stated that while driving at an undisclosed speed, the contact became aware that the transmission was slipping. No warning lights were illuminated. The vehicle was taken to an independent mechanic, where it was diagnosed with torque converter failure. The contact was informed that the transmission needed to be replaced. The vehicle was in the process of being repaired. The contact referenced an unknown recall; however, the VIN was not associated with a recall associated with the failure. The manufacturer was not made aware of the failure. The failure mileage was approximately 130,000.

Filed May 5, 2026 · Electrical, Transmission · TN

While flat towing my 2022 Ford F‑350 behind a motorhome using Ford’s Neutral Tow Mode procedure, the vehicle suffered a catastrophic transmission failure. The Ford dealer documented this clearly on the service invoice: “HAPPENED WHILE THE VEHICLE WAS FLAT TOWED.” After the tow, the truck had severe slipping, delayed engagement, high RPM with no movement, and a wrench light. The dealer confirmed fault codes P0741, P1744, and P27B4. The dealer found catastrophic internal damage: “fluid is burnt with metal debris… filter is packed with metal debris… torque converter has came apart and filled transmission with metal debris… it is catastrophic failure.” These components are available for inspection. The dealer also documented a low battery condition: “batteries. low state of charge.” Ford’s Neutral Tow Mode relies on electronic control modules that require stable voltage, but Ford provides no warning that low voltage can cause the transfer case to exit Neutral Tow Mode. This creates a safety risk because the transmission can be rotated internally without lubrication while being towed, which can lead to sudden drivetrain lockup or loss of control. The problem was confirmed by the Ford dealer, and the vehicle was fully inspected by them. The only warning symptom occurred after towing: wrench light, slipping, and no movement. There were no warnings during the tow itself. This failure mode is not disclosed by Ford and cannot be detected or prevented by the owner.

Filed Apr 12, 2026 · Transmission · WA

Vehicle experienced sudden, unexpected downshifting and loss of gear engagement while driving. On multiple occasions the transmission slipped out of gear without warning, including while attempting to pull into traffic, creating an immediate life-threatening safety hazard. Vehicle was unable to maintain gear selection and would unexpectedly lose drive power. These failures match the exact defect described in the federal safety agency recall 22V256000

Filed Dec 22, 2024 · Transmission · SC

The transmission slips and hard shifts. I honestly believe the dealership knew and sold it to us knowing since we found out afterwards it's a known issue and in the bulletin about the truck.

Filed Mar 14, 2024 · Transmission · 113,000 miles · MN

The contact owns a 2020 Ford F-350. The contact stated that while driving at various speed, the transmission was slipping while downshifting and upshifting. The contact also stated that there was a hard shift, and the vehicle would lose motive power and lunge forward. The wrench warning light was illuminated. The contact stated that a dealer representative went to the residence to perform a software update however, the failure persisted, and the vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 113,000.

Filed Dec 13, 2023 · Transmission · 50,000 miles · MA

The contact owns a 2016 Ford F-350. The contact stated while driving at various speeds, the transmission was shifting hard and was slipping. Additionally, the vehicle was shuddering while the transmission was shifting. An unknown warning light was illuminated. The vehicle was taken to the dealer; however, the cause of the failure could not be determined. The contact stated that the failure persisted. The vehicle was taken to a transmission specialist, where it was diagnosed that the transmission had failed and needed to be replaced. The vehicle was being repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 50,000. The VIN was unavailable.

Filed Dec 7, 2023 · Electrical, Transmission · UT

What component or system failed or malfunctioned, and is it available for inspection upon request? Transfer case shift motor failure, transmission slipping in 3,2,1 gear and when accelerating from 7-8 gear. Electronics on dash have gone out while driving multiple times. Tailgate opened up while driving multiple times. Trailer brake. Drivers side faulty window (glass) fracture across entire window when not moving. Yes, all can be inspected or paper work reviewed for repairs complete. How was your safety or the safety of others put at risk? Could not use 4 wheel drive in icy/snowy conditions to get to destination. Transmission slipping caused my foot to come off brake pedal and immediately had to reengage brake pedal due to the force of the transmission slipping (like the transmission was falling out from under the truck), nearly hitting the car in front of me on both occasions. Has the problem been reproduced or confirmed by a dealer or independent service center? Yes. All issues have been confirmed by local Ford dealer and fixed by certified Ford mechanic, but once issue is repaired, the electronics issues and transmission issue continue to arise (exact same issues). Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? Yes, by the dealership (Ford representatives). Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? No, no warning signs for any of the defects other than a letter for the tailgate recall, brake recall and wiper recall.

Filed Jun 30, 2023 · Transmission · 25,500 miles · NV

The contact owns a 2020 Ford F-350. The contact stated while driving 60-65 MPH, the transmission was slipping and unintendedly downshifting. The contact stated that upon driving from a complete stop, the vehicle stalled with the transmission stuck in 10th gear, nearly causing a crash. The contact stated that the vehicle responded as needed upon depressing the accelerator pedal a second time. The contact stated that the failure recurred while driving. The power train malfunction warning light was illuminated. The vehicle was taken to the dealer, who informed the contact that the earliest appointment for a diagnostic test would be approximately 6 weeks. The vehicle was not diagnosed nor repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 25,500.

Filed Apr 26, 2023 · Transmission · 109,000 miles · TX

The contact owns a 2020 Ford F-350. The contact stated that while driving at approximately 65 MH, the transmission was slipping while downshifting and upshifting. The contact also stated that after starting the vehicle, the transmission seized after shifting into 4th gear, with the powertrain malfunction warning light illuminated. The contact stated that the vehicle was inoperable. The vehicle had not yet been taken to an independent mechanic or a local dealer. The contact became aware of Customer Satisfaction Program: 21B03 (Transmission - Number One Planetary and Ring Gear Assembly); however, the VIN was not included. The manufacturer was made aware of the failure and advised the contact to file a complaint with the federal safety agency Hotline. The approximate failure mileage was 109,000.